Apache Poi 简明教程

Apache POI - Formula

本章将引导您了解使用 Java 编程在单元格上应用不同的公式。Excel 应用程序的基本目的是通过在其上应用公式来维护数字数据。

在公式中，我们传递 Excel 表中值动态值或位置。在执行此公式后，您将获得所需的结果。下表列出了 Excel 中经常使用的一些基本公式。

Operation

Syntax

Adding multiple numbers

= SUM(Loc1:Locn) or = SUM(n1,n2,)

Count

= COUNT(Loc1:Locn) or = COUNT(n1,n2,)

Power of two numbers

= POWER(Loc1,Loc2) or = POWER(number, power)

Max of multiple numbers

= MAX(Loc1:Locn) or = MAX(n1,n2,)

Product

=PRODUCT(Loc1:Locn) or = PRODUCT(n1,n2,)

Factorial

= FACT(Locn) or = FACT(数字)

Absolute number

= ABS(Locn) or = ABS(数字)

Today date

=TODAY()

Converts lowercase

= LOWER(Locn) or = LOWER(文本)

Square root

= SQRT(locn) or = SQRT(数字)

以下代码用来给单元格添加公式并执行它。

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Formula {
   public static void main(String[] args)throws Exception {
      XSSFWorkbook workbook = new XSSFWorkbook();
      XSSFSheet spreadsheet = workbook.createSheet("formula");
      XSSFRow row = spreadsheet.createRow(1);
      XSSFCell cell = row.createCell(1);

      cell.setCellValue("A = ");
      cell = row.createCell(2);
      cell.setCellValue(2);
      row = spreadsheet.createRow(2);
      cell = row.createCell(1);
      cell.setCellValue("B = ");
      cell = row.createCell(2);
      cell.setCellValue(4);
      row = spreadsheet.createRow(3);
      cell = row.createCell(1);
      cell.setCellValue("Total = ");
      cell = row.createCell(2);

      // Create SUM formula
      cell.setCellFormula("SUM(C2:C3)");
      cell = row.createCell(3);
      cell.setCellValue("SUM(C2:C3)");
      row = spreadsheet.createRow(4);
      cell = row.createCell(1);
      cell.setCellValue("POWER =");
      cell=row.createCell(2);

      // Create POWER formula
      cell.setCellFormula("POWER(C2,C3)");
      cell = row.createCell(3);
      cell.setCellValue("POWER(C2,C3)");
      row = spreadsheet.createRow(5);
      cell = row.createCell(1);
      cell.setCellValue("MAX = ");
      cell = row.createCell(2);

      // Create MAX formula
      cell.setCellFormula("MAX(C2,C3)");
      cell = row.createCell(3);
      cell.setCellValue("MAX(C2,C3)");
      row = spreadsheet.createRow(6);
      cell = row.createCell(1);
      cell.setCellValue("FACT = ");
      cell = row.createCell(2);

      // Create FACT formula
      cell.setCellFormula("FACT(C3)");
      cell = row.createCell(3);
      cell.setCellValue("FACT(C3)");
      row = spreadsheet.createRow(7);
      cell = row.createCell(1);
      cell.setCellValue("SQRT = ");
      cell = row.createCell(2);

      // Create SQRT formula
      cell.setCellFormula("SQRT(C5)");
      cell = row.createCell(3);
      cell.setCellValue("SQRT(C5)");
      workbook.getCreationHelper().createFormulaEvaluator().evaluateAll();
      FileOutputStream out = new FileOutputStream(new File("formula.xlsx"));
      workbook.write(out);
      out.close();
      System.out.println("fromula.xlsx written successfully");
   }
}

将以上代码保存在 Formula.java 中，然后从命令行处编译并执行它，如下所示 −

$javac Formula.java
$java Formula

它将在你的当前目录中生成名为 formula.xlsx 的 Excel 文件，并在命令行中显示以下输出。

fromula.xlsx written successfully

formula.xlsx 文件如下： −

formula